law in arizona. right, jamie? >> reporter: right, in fact, i just walked past the supreme court coming in. there was a pretty healthy crowd in line waiting to see the case, which started a few minutes ago. basically, this law was approved in arizona in 2004. it says that if you are going to register to court, you have to -- vote, you have to show documents to prove you are a u.s. citizen. the obama administration opposes it. they offer it's an effort to keep minorities from voting. those for it, says look, it's very simple. it's to stop noncitizens and especially illegal immigrants from voting in u.s. elections. federal courts have been split on the issue. an appeals court did strike it down. this issue has not gotten a lot of attention. it could prove to be a mid one when the court wraps up its term in june. >> a lot of people wonder if a lot of illegal immigrants are starting to vote and according to one poll, they said .001% of florida's voters turned out to be illegal. so why there is so much attention for what really is a small problem?